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典型文献
Thermal Conductivity and Thermal Diffusivity of Ferrosilite under High Temperature and High Pressure
文献摘要:
Orthopyroxene is an important constitutive mineral in the crust and the upper mantle.Its thermal properties play a key role in constructing the thermal structure of the crust and the upper mantle.In this study,we developed a new method to synthesize polycrystalline ferrosilite,one end-member of orthopyroxene,via the reaction of FeO+SiO2 → FeSiO3.We found that the P-T condition of 3 GPa and 1 273 K is suitable to synthesize dense ferrosilite samples with low porosity.We employed the transient plane-source method to investigate the thermal conductivity κ and thermal diffusivity D of synthetic ferrosilite at 1 GPa and 293-873 K,of which,κ=1.786+1.048×103T-1-9.269×104T-2 and D=0.424+0.223×103T-1+1.64×104T-2.Our results suggest phonon conduction should be the domi-nant mechanism at P-T conditions of interest since the thermal conductivity and the thermal diffusivity of ferrosilite both decrease with increasing temperature.The calculated heat capacity of ferrosilite at 1 GPa increases with temperature,which increases with increasing temperature with about 10%per 100 K(<500 K)and 4%per 100 K(>500 K).Iron content of an asteroid significantly influences its thermal evolution history and temperature distribution inside.It is expected that the mantle temperature of the Fe-rich asteroid will be higher and the Fe-rich asteroid's cooling history will be longer.
文献关键词:
作者姓名:
Bo Feng;Xinzhuan Guo
作者机构:
Key Laboratory for High-Temperature and High-Pressure Study of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China
引用格式:
[1]Bo Feng;Xinzhuan Guo-.Thermal Conductivity and Thermal Diffusivity of Ferrosilite under High Temperature and High Pressure)[J].地球科学学刊(英文版),2022(03):770-777
A类:
Ferrosilite,Orthopyroxene,ferrosilite,FeO+SiO2,FeSiO3,786+1,103T,104T,424+0
B类:
Thermal,Conductivity,Diffusivity,under,High,Temperature,Pressure,important,constitutive,mineral,crust,upper,mantle,Its,thermal,properties,play,key,role,constructing,structure,In,this,study,we,developed,new,method,synthesize,polycrystalline,one,end,member,orthopyroxene,via,reaction,We,found,that,GPa,suitable,dense,samples,low,porosity,employed,transient,plane,source,investigate,conductivity,diffusivity,synthetic,which,1+1,Our,results,suggest,phonon,conduction,should,domi,nant,mechanism,conditions,interest,since,both,decrease,increasing,temperature,calculated,heat,capacity,increases,about,Iron,content,asteroid,significantly,influences,its,evolution,history,distribution,inside,expected,rich,will,higher,cooling,longer
AB值:
0.480148
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